WO2012081308A1

WO2012081308A1 - Projector and control method

Info

Publication number: WO2012081308A1
Application number: PCT/JP2011/074160
Authority: WO
Inventors: 想西村; 石橋　修; 柳田　美穂
Original assignee: 日本電気株式会社
Priority date: 2010-12-13
Filing date: 2011-10-20
Publication date: 2012-06-21
Also published as: CN103262145A; JPWO2012081308A1; US20130229630A1

Abstract

The present invention provides a projector which can solve the problem of low light use efficiency. A screen (10) has color stripes disposed at intervals, said color stripes generating visible light corresponding to inputted light. A laser light source unit (11) outputs an optical beam. A laser scanning unit (12) scans areas where the color stripes are disposed on the screen (10) with the optical beam outputted from the laser light source unit (11). A light detecting unit (13) detects feedback light from the screen (10) with respect to the optical beam. A control unit (14) adjusts light emitting timing and light emitting period of the laser light source unit (11), on the basis of detection results obtained from the light detecting unit (13), and has the optical beam outputted from the laser light source unit (11) such that optical pulses are inputted within each of the color stripes.

Description

Projector and control method

The present invention relates to a projector that displays an image by scanning a screen with a light beam.

In recent years, a scanning projector that displays an image by scanning a fluorescent screen with a light beam has attracted attention. In such a scanning projector, a resonant scanning element such as a galvanometer mirror is often used as a scanning means for scanning the fluorescent screen. Resonant scanning elements have the advantage of being able to perform high-speed scanning, but on the other hand, since the scanning speed and scanning amplitude are likely to change depending on the ambient temperature, the light beam is directed to an appropriate incident position on the screen. It is not easy to enter.

On the other hand, Patent Document 1 discloses a scanning beam display system capable of adjusting the incident position of a light beam on a screen.

In the fluorescent screen used in the scanning beam display system of Patent Document 1, a plurality of fluorescent stripes are periodically arranged, and servo reference marks that reflect the light beam are arranged between the fluorescent stripes.

The scanning beam display system emits a light beam composed of a plurality of light pulses from a light source, and scans the fluorescent screen in the direction perpendicular to the fluorescent stripe with the light beam, thereby exciting the phosphors of each fluorescent stripe. To display the image.

Also, the scanning beam display system changes the incident position of the light pulse on the screen for each scan by changing the light emission timing of the light source for each scan. When the incident position of the light pulse changes, the amount of light incident on the servo reference mark changes, so the amplitude of the feedback light from the servo reference mark also changes. The scanning beam display system detects the change in the amplitude of the feedback light, and adjusts the light emission timing of the light source according to the detection result, so that the light pulse is incident on the fluorescent stripe. Adjust.

Special table 2009-539120

When the scanning speed of the resonant scanning element changes, even if a light pulse having a constant pulse width is emitted from the light source, the irradiation area on the screen due to the light pulse changes.

In the scanning beam display system of Patent Document 1, the light emission timing of the light source is adjusted, but the light emission period of the light source is not adjusted, and light pulses having the same pulse width are emitted even when the scanning speed changes. For this reason, the irradiation region of the light pulse becomes larger than necessary, and the irradiation region on the screen due to the light pulse protrudes from the fluorescent stripe, and there is a problem that the light utilization efficiency is reduced.

An object of the present invention is to provide a projector and a control method capable of solving the above-described problem that the light use efficiency is lowered.

The projector according to the present invention includes a screen in which color stripes that generate visible light according to incident light are periodically arranged, a light source that emits a light beam, and the color stripes on the screen are arranged with the light beam. A projection unit that scans a region, a detection unit that detects feedback light from the screen with respect to the light beam, and a light emission timing and a light emission period of the light source based on a detection result of the detection unit, And a controller that emits the light beam from the light source so that a light pulse is incident on the color stripe.

Also, the control method according to the present invention includes a screen in which color stripes that generate visible light according to incident light are periodically arranged, a light source that emits a light beam, and the light beam, the color stripes on the screen. And a projection unit that scans a region where the light source is disposed, and detects a feedback light from the screen to the light beam, and based on the detection result, the light emission timing and light emission of the light source The light beam is emitted from the light source so that a light pulse is incident on each color stripe by adjusting the period.

According to the present invention, it is possible to increase the light use efficiency.

It is a figure which shows the projector of the 1st Embodiment of this invention. It is a figure which shows the specific structural example of a screen. It is a flowchart for demonstrating operation | movement of a projector. It is a figure for demonstrating an example of the calculation method which calculates | requires the correlation of the emission timing of a light pulse for a display, and a pulse width. It is a figure for demonstrating the other example of the calculation method which calculates | requires the correlation of the emission timing of a display optical pulse, and a pulse width. It is a figure for demonstrating the other example of the calculation method which calculates | requires the correlation of the emission timing of a display optical pulse, and a pulse width. It is a figure which shows the parameter for determining the emission timing and pulse width of a display optical pulse. It is a figure which shows a mode that a screen is scanned with a laser beam. It is a figure which shows an example of a multi projector system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, components having the same function may be denoted by the same reference numerals and description thereof may be omitted.

FIG. 1 is a diagram showing a projector according to a first embodiment of the present invention. A projector 1 shown in FIG. 1 is a scanning rear projector that displays an image by scanning the back surface of a screen with a laser beam that is a light beam, and includes a screen 10, a laser light source unit 11, a laser projection unit 12, A light detection unit 13 and a control unit 14 are provided.

On the screen 10, color stripes that generate visible light according to incident light are periodically arranged in the in-plane direction, and black stripes that block incident light are arranged between the color stripes.

FIG. 2 is a diagram showing a specific configuration of a part of the screen 10. As shown in FIG. 2, on the screen 10, color stripes 21 are periodically arranged, and black stripes 22 are arranged between the color stripes.

The color stripe 21 is a region formed of a phosphor, and is a region that generates fluorescence in response to incident light and emits it to the front surface of the screen. It is assumed that the fluorescence wavelength is in the visible light region.

In FIG. 2, the

color stripes

21A, 21B and 21C, which are three sub-color stripes having different fluorescence wavelengths, are arranged in a specific direction in this order as the color stripe 21. For example, the color stripe 21A generates red fluorescence, the color stripe 21B generates green fluorescence, and the color stripe 21C generates blue fluorescence. The color stripes 21 are arranged in the horizontal direction so that the horizontal scanning direction by the laser projection unit 12 intersects the longitudinal direction of the color stripes 21.

Note that when the laser light applied to the screen 10 is visible light (wavelength: about 380 nm to 730 nm), the color stripe 21 may be formed of a light diffusing material instead of the phosphor. In this case, the color stripe 21 generates visible light for display by diffusing laser light, and emits it to the front surface of the screen 10.

The black stripe 22 is a region that shields the laser beam from being transmitted through the front surface of the screen 10 by absorbing or reflecting the laser beam. The reflection includes diffuse reflection and retroreflection.

In addition, at least one of the color stripe 21 and the black stripe 22 reflects the laser light (including diffuse reflection or retroreflection) or converts the laser light into light of another wavelength and diffuses the reflected light or diffused light. At least a part of the light is configured to be guided to the light detection unit 13 as feedback light. Here, the light of other wavelengths is, for example, fluorescence generated in the color stripe 21.

Returning to the explanation of FIG. The laser light source unit 11 is a light source composed of a semiconductor laser element or a solid-state laser element, and emits laser light.

The laser projection unit 12 displays an image on the screen 10 by scanning the area where the color stripes are arranged on the back surface of the screen 10 with the laser light emitted from the LD light source unit 11. The laser projection unit 12 only needs to scan the screen 10 at least in the horizontal direction, and drawing of the image in the vertical direction may be performed by a one-dimensional SLM (spatial light modulator) or the like. Further, as a scanning means for scanning the screen 10 with laser light, a resonant light scanning element such as a galvanometer mirror is desirable.

The light detection unit 13 is a detection unit that includes a photoelectric conversion device and detects feedback light from the screen 10 with respect to the laser light projected on the screen 10. Examples of the photoelectric conversion device include a PD (photodiode) such as an APD (avalanche photodiode).

The control unit 14 performs calibration for adjusting the image display area on the screen 10 and the light emission timing of the laser light source unit 11. For example, the control unit 14 adjusts the light emission timing and the light emission period of the laser light source unit 11 based on the detection result of the light detection unit 13 so that the light pulse is incident on each color stripe 21 on the screen 10.

When the calibration is completed, the control unit 14 scans according to the input video signal while emitting the laser light from the laser light source unit 11 so that the light pulse is incident on each color stripe 21 according to the result of the calibration. The laser projection unit 12 is executed to display an image corresponding to the input video signal on the screen 10.

Next, the operation of the projector 1 will be described.

FIG. 3 is a flowchart for explaining the operation of the projector 1.

When the projector 1 is activated, the control unit 14 executes calibration. For example, the projector 1 includes a power-on switch (not shown), and when the switch is turned on, the control unit 14 determines that the projector 1 is activated and executes calibration.

In calibration, first, the control unit 14 adjusts the scanning amplitude of the laser projection unit 12 to adjust the image display area (step S301).

Subsequently, the control unit 14 performs phase matching for synchronizing the horizontal scanning frequency of the laser projection unit 12 and the horizontal synchronization signal of the input video signal (step S302).

Thereafter, the control unit 14 causes the laser light source unit 11 to emit continuous light as laser light, and causes the laser projection unit 12 to scan the screen 10 in the horizontal scanning direction, based on the detection result of the light detection unit 13 in the scanning. Then, the irradiation timing adjustment for generating the control information indicating the emission timing and the pulse width of each light pulse incident on each color stripe 21 is performed, and the calibration is completed (step S303).

The control unit 14 uses the laser light source unit 11 and the laser projection unit 12 to adjust the light emission timing and the light emission period of the laser light source unit 11 based on the control information generated in step S303, and according to the input video signal. Scanning is performed, and an image corresponding to the input video signal is displayed on the screen 10 (step S304). Note that the luminance of the display image can be changed by adjusting the amplitude of the light pulse.

Next, the irradiation timing adjustment by the control unit 14 will be described in more detail.

In the irradiation timing adjustment, first, the control unit 14 scans the screen 10 in the horizontal scanning direction with continuous light using the laser light source unit 11 and the laser projection unit 12, and based on the detection result by the light detection unit 13 in the scanning. Thus, the correlation between the emission timing and the pulse width of the display light pulse that is the light pulse incident on each color stripe 21 is obtained.

FIG. 4 is a diagram for explaining a first calculation method for obtaining the correlation between the emission timing and the pulse width of the display light pulse.

In the example shown in FIG. 4, the light detection unit 13 detects sub-feedback light that is a plurality of light pulses from each color stripe 21 as feedback light from the screen 10.

Here, according to the optical detection unit 13, the detection timing (detection start time) to t _i of the sub-feedback light from the i-th color stripe 21 in the horizontal scanning _direction, and the detection width and d _i. The pulse width of each display light pulse incident on each color stripe 21 is the same value W, and the emission timing of the display light pulse incident on the i-th color stripe 21 is a _i . In this case, the control unit 14 determines the mutual relationship between the emission timing of the display light pulse and the pulse width.

I ask.

FIG. 5 is a diagram for explaining a second calculation method for obtaining the correlation between the emission timing of the display light pulse and the pulse width.

In the example shown in FIG. 5, the light detection unit 13 detects a plurality of subfield lights that are light pulses from a plurality of predetermined detection stripes of the color stripe 21 as feedback light.

Here, the detection timing of the sub-feedback light from the i-th detection stripe in the horizontal scanning direction by the light detection unit 13 is t _i , and the detection width is d _i . Also, the number of target color stripes that are color stripes from the i-th detection stripe to the color stripe before the next detection stripe is n, and the pulse width of the display light pulse incident on each color stripe 21 is , The same value W, and the emission timing of the display light pulse incident on the j-th target color stripe counted from the i-th detection stripe is aj _i .

In this case, the control unit 14 determines the correlation between the emission timing of the display light pulse and the pulse width,

I ask.

In the second calculation method, for example, when the detection stripe is a predetermined color stripe of the

color stripes

21A, 21B, and 21C, the correlation between the emission timing of the display light pulse and the pulse width is n = 3

It becomes.

FIG. 6 is a diagram for explaining a third calculation method for obtaining the correlation between the emission timing of the display light pulse and the pulse width.

In the example illustrated in FIG. 6, the light detection unit 13 detects a plurality of sub-feedback lights that are light pulses from each black stripe 22 as feedback light.

Here, the detection timing of the sub-feedback light from the i-th black stripe in the horizontal scanning direction by the light detection unit 13 is t _i , and the detection width is d _i . Further, the pulse width of each display light pulses incident on each color stripe 21, the same value is W, the emission timing of the display light pulses incident on the i-th color stripe and b _i. In this case, the control unit 14 determines the mutual relationship between the emission timing of the display light pulse and the pulse width.

I ask.

When the control unit 14 obtains the mutual relationship between the emission timing and the pulse width of the display light pulse by the above first to third calculation methods, it is displayed on each color stripe as shown in FIGS. An optical pulse can be incident.

Further, if d _i > W is satisfied for all the detection widths d _i , the display light pulse can be contained in the color stripe. Therefore, if the pulse width W is set sufficiently small in advance, the control unit 14 can suppress the display light pulse from protruding from the desired color stripe and entering the other color stripe or black stripe. , Light utilization efficiency can be increased.

However, if the pulse width is small, the brightness of the image may be reduced. For this reason, when the control unit 14 obtains the mutual relationship between the emission timing and the pulse width of the display light pulse, the control unit 14 further sets the pulse width of each display light pulse in order to optimize the pulse width of the display light pulse. Ask.

For example, the control unit 14 uses the laser light source unit 11 and the laser projection unit 12 to scan the screen 10 in the horizontal scanning direction with a pulse train composed of a plurality of adjustment light pulses having the above-described correlations, and performs light detection in the scanning. Based on the detection result of the unit 13, the pulse width of each display light pulse is determined.

More specifically, the control unit 14 repeatedly scans the screen 10 in the horizontal scanning direction with the above pulse train while gradually increasing the pulse width of the light control light pulse in the pulse train, and the detection result in each scan Based on the above, the pulse width of the display light pulse is determined. It is assumed that the light control light pulses in the pulse train in each scan have the same pulse width.

Here, it is assumed that the light detection unit 13 detects feedback light from each of the color stripes 21. At this time, the control unit 14 determines that the adjustment light pulse at the current scanning time is not increased from the detection period at the previous scanning time among the plurality of detection time periods of each sub feedback light. The pulse width is determined as the pulse width of the display light pulse.

If the detection period of a certain sub feedback light does not increase, the light control light pulse corresponding to the sub feedback light protrudes from the color stripe 21. Therefore, in the above method, the pulse width of the adjustment light pulse when any of the light control light pulses protrudes from the color stripe 21 is determined as the pulse width of the display light pulse. The light quantity of the light pulse incident on can be maximized. For this reason, it becomes possible to reduce the utilization efficiency of a laser beam, maximizing the brightness | luminance of a display image.

When the light detection unit 13 detects the feedback light from each of the color stripes 21, the control unit 14 obtains the sum of the luminances of the sub-feedback lights, and the increase rate is linear for each scan of the sum of the luminances. If not, the pulse width of the adjustment optical pulse during the current scan may be determined as the pulse width of the display optical pulse.

In this case, since the pulse width of the adjustment light pulse when the luminance increase rate becomes low is the pulse width of the display light pulse, the laser light utilization efficiency is maximized and the highest utilization efficiency is achieved. Thus, the brightness of the display image can be maximized.

In addition to the above method, the control unit 14 determines the maximum value of the moving speed of the incident position of the laser beam on the screen 10 based on the detection result in the same scanning as when the correlation between the emission timing and the pulse width is obtained. May be obtained, and the pulse width of the display light pulse may be obtained based on the maximum movement speed V.

In this case, as shown in FIG. 7, when the width of each color stripe 21 is R, the width of each black stripe 22 is Q, and the beam diameter of the laser beam is D, the control unit 14 sets each pulse width W to When Q> D, W = (R + 2D) / V is determined, and when Q <D, W = (R + 2Q−D) / V. It is assumed that the width R of each color stripe 21, the width Q of each black stripe 22, and the beam diameter D of the laser beam are fixed values and are held in advance by the control unit 14. In this case, it is possible to reduce the utilization efficiency of the laser light while maximizing the luminance of the display image.

Further, the control unit 14 may set each pulse width W to W = (RD) / V. in this case,
The utilization efficiency of the laser beam is maximized, and the luminance of the display image can be maximized at the utilization efficiency.

When the control unit 14 obtains the mutual relationship between the emission timing and pulse width of the display optical pulse and the pulse width of the display optical pulse as described above, the control unit 14 determines the display optical pulse based on the mutual relationship and the pulse width. The control information indicating the emission timing and the pulse width is generated. For example, the control unit 14 substitutes the obtained pulse width into the correlation, obtains the emission timing, and generates control information indicating the obtained pulse width and the emission timing.

When generating the control information, the control unit 14 holds the control information or records the control information in a memory (not shown) outside the control unit 14.

FIG. 8 is a diagram showing a state in which the screen 10 is scanned with laser light in the projector 1 configured as described above. In FIG. 8, the laser scanning unit 30 includes the laser light source unit 11, the laser projection unit 12, the light detection unit 13, and the control unit 14 illustrated in FIG. 1.

In the example shown in FIG. 8, the image drawing start position is the upper left of the display area 31. The laser light projected from the laser scanning unit 30 moves on the screen 10 in a direction intersecting the longitudinal direction of the color stripe 21. The incident position of the laser beam on the screen 10 moves from the left end to the right end within the display area as shown by the locus 32, and when it reaches the right end, it is folded and moved to the left end. Then, the incident position of the laser beam is folded at the left end and moves again to the right end. Such scanning is continuously performed from the upper side to the lower side.

In the projector 1 of the present embodiment, the longitudinal direction of the color stripe 21 is in the vertical direction, and the laser scanning unit 30 scans the screen 10 in the horizontal direction so that the incident position of the laser beam is the color stripe 21. It is moved in a direction intersecting with the longitudinal direction. However, in the projector 1, the longitudinal direction of the color stripe 21 is oriented in the horizontal direction, and the laser scanning unit 30 scans the screen 10 in the vertical direction so that the incident position of the laser light is the longitudinal direction of the color stripe 21. You may move to the direction which crosses.

As described above, according to the present embodiment, the light emission timing and the light emission period of the laser light source unit 11 are adjusted based on the detection result of the light detection unit 13 so that the light pulse is incident on each color stripe. Therefore, even if the scanning speed of the projector 1 changes, it becomes possible to store the light pulse in the color stripe 21 and to increase the utilization efficiency of the laser light from the laser light source unit 11.

Next, a second embodiment of the present invention will be described.

In the present embodiment, the control unit 14 adjusts the emission timing and the pulse width of the display light pulse while the calibration is completed and scanning according to the input video signal is performed.

When the calibration is completed, the control unit 14 causes the laser light source unit 11 and the laser projection unit 12 to perform scanning according to the input video signal using a pulse train including display light pulses.

At this time, the control unit 14 obtains the maximum movement speed V of the laser light on the screen 10 based on the detection result of the light detection unit 13 at the time of scanning, and corrects the control information based on the maximum movement speed V. . For example, the control unit 14 obtains the pulse width and emission timing of the display light pulse from the movement maximum velocity V from the movement maximum velocity V, and sets the pulse width and emission timing indicated by the control information to the obtained pulse width and emission timing. to correct.

The timing for correcting the control information may be every frame of the display image, every predetermined frame, or every horizontal scan. Further, the method for obtaining the pulse width and the emission timing of the display light pulse from the maximum moving speed V may be the same method as described in the first embodiment.

According to the present embodiment, since the control information is corrected during scanning according to the input video signal, even if the scanning speed changes during scanning according to the input video signal, the brightness of the display image is optimized. Can be.

In each of the embodiments described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

For example, the projector 1 may be applied to projectors 1-1 to 1-9 of a multi-projector system as shown in FIG. Here, the multi-projector system displays the projected images of the projectors 1-1 to 1-9 side by side on a screen to form a large display image. The number of projectors in the multi-projector system is only nine in FIG.

When the projector 1 is applied to a multi-projector system, the projector 1 does not need to be provided with a special mark for generating feedback light or the like other than the display area. A seamless multi-projector system can be configured.

This application claims priority based on Japanese Patent Application No. 2010-276835 filed on Dec. 13, 2010, the entire disclosure of which is incorporated herein.

Claims

A screen in which color stripes that generate visible light according to incident light are periodically arranged;
A light source that emits a light beam;
A projection unit that scans an area of the screen where the color stripes are arranged with the light beam;
A detector for detecting feedback light from the screen with respect to the light beam;
A control unit that adjusts the light emission timing and the light emission period of the light source based on the detection result of the detection unit, and causes the light beam to be emitted from the light source so that a light pulse enters each color stripe; Projector.
The projector according to claim 1, wherein
The control unit causes the light source to emit continuous light as the light beam, and causes the projection unit to scan the screen in a direction intersecting each color stripe, and based on the detection result in the scanning, each light pulse A projector that generates control information indicating the respective emission timings and pulse widths, and adjusts the light emission timing and light emission period of the light source according to the control information.
The projector according to claim 2,
The control unit obtains the relationship between the emission timing and pulse width of each optical pulse and the pulse width of each optical pulse based on the detection result, and generates the control information according to the obtained relationship and pulse width. A projector.
The projector according to claim 3, wherein
The detection unit detects a plurality of sub-feedback lights from each color stripe as the feedback light,
The control unit sets the detection timing of the sub-feedback light from the i-th color stripe in the direction as t i , the detection width of the sub-feedback light as d i , and the emission timing of the light pulse incident on the i-th color stripe. A i and the pulse width of each light pulse as W,

I ask for a projector.
The projector according to claim 3, wherein
The detection unit detects a plurality of sub-feedback lights from a plurality of predetermined detection stripes among the plurality of color stripes as the feedback light,
The control unit sets the detection timing of feedback light from the i-th detection stripe in the direction to t i , the detection width of the feedback light to d i , and the detection stripe of the next detection stripe from the i-th detection stripe. The number of target color stripes up to the previous color stripe is n, the emission timing of light pulses incident on the jth target color stripe counted from the i-th detection stripe is aj i , and the pulse width of each light pulse Is W, the relationship is

I ask for a projector.
The projector according to claim 5, wherein
In the screen, as the color stripe, a plurality of sub-color stripes having different visible light wavelengths are periodically arranged in a predetermined order,
The detection stripe is a projector that is a sub-color stripe that generates visible light having a predetermined wavelength among the sub-color stripes.
The projector according to claim 3, wherein
In the screen, black stripes that block incident light are arranged between the color stripes,
The detection unit detects a plurality of sub-feedback lights from each black stripe as the feedback light,
The control unit makes the detection timing of the sub-feedback light from the i-th black stripe in the direction t i , the detection width of the sub-feedback light is d i , and enters the color stripe next to the i-th black stripe. When the emission timing of the optical pulse is b i and the pulse width of each optical pulse is W, the relationship is

I ask for a projector.
The projector according to any one of claims 3 to 7,
The control unit obtains the maximum moving speed V of the incident position of the light beam on the screen based on the detection result, the width of each color stripe is R, the width of each black stripe is Q, and the beam of the light beam When the diameter is D, the pulse width W of each optical pulse is obtained as W = (R + 2D) / V when Q> D, and as W = (R + 2Q−D) / V when Q <D. projector.
The projector according to any one of claims 3 to 7,
The control unit obtains the maximum moving speed V of the incident position of the light beam on the screen, and sets the width of each color stripe as R, the beam diameter of the light beam as D, and the pulse width W of each light pulse. A projector that obtains (RD) / V.
The projector according to any one of claims 3 to 7,
The control unit uses the light source and the projection unit to repeatedly scan in the direction while increasing the pulse width of each adjustment light pulse with the plurality of adjustment light pulses having the relationship, and A projector that determines a pulse width of each light pulse based on a detection result of a detection unit.
The projector according to claim 10, wherein
The detection unit detects a plurality of second sub-feedback lights from each color stripe as the feedback light in each scan,
In the detection period of each second sub-feedback light, the control unit determines the pulse width of each adjustment optical pulse in the current scan for each light when there is no increase in the detection period in the previous scan. The projector that is calculated as the pulse width of the pulse.
The projector according to claim 10, wherein
The detection unit detects a plurality of second sub-feedback lights from each color stripe as the feedback light in each scan,
The control unit obtains the pulse width of each adjustment optical pulse in the current scan as the pulse width of each light pulse when the rate of increase in the sum of the brightness of each second sub-feedback light for each scan is not linear. .
The projector according to any one of claims 2 to 12,
The control unit causes the projection unit to perform a scan according to an input video signal while adjusting a light emission timing and a light emission period of the light source, and corrects the control information based on the detection result in the scan. projector.
A screen in which color stripes that generate visible light according to incident light are periodically arranged, a light source that emits a light beam, and a projection that scans an area of the screen where the color stripe is arranged with the light beam. And a projector control method comprising:
Detecting feedback light from the screen to the light beam;
A control method of adjusting the light emission timing and light emission period of the light source based on the detection result to emit the light beam from the light source so that a light pulse is incident on each color stripe.